新手入门，求解答~~~~

Question

我们说数值交换必须用指针或引用，那求最大公约数的时候用a=m; m=n; n=a;它的数值怎么就可以换了？

Answer 1

Getting started for newbies, please answer~~~~-PHP Chinese website Q&A-Getting started for newbies, please answer~~~~-PHP Chinese website Q&A

Look around and learn.

Answer 2

地址交换需要用指针或者引用，而数值交换以赋值的形式就可以